International Energy Agency: Energy Conservation through Energy Storage IEA: ECES

There are five active annexes:

  • Annex 21 Thermal Response Test for Underground Thermal Energy Storages
  • Annex 23 Applying Energy Storage in Ultra-low Energy Buildings
  • Annex 24 Material Development for Improved Thermal Energy Storage Systems
  • Annex 25 Surplus Heat Management Using Advanced Thermal Energy Storage
  • Annex 26 Electrical Energy Storage - Future Energy Storage Demand


The MERITS consortium is working on a new solution for improved use of renewable sources for heating, cooling and domestic hot water applications in individual (new & existing) dwellings in three climate zones. The aim is to build a prototype of a fully functioning compact rechargeable heat battery that would fit in for example a cellar or underground a garden. In addition, business models and market strategies are developed to foster market take-up before 2020.


The overall objective of the project is the development, evaluation and demonstration of a low energy heating system based on Seasonal Thermal Energy Storage (STES) systems in combination with Heat Pumps for space heating and domestic hot water (DHW) requirements for existing buildings to drastically reduce energy consumption in buildings.


The Energy Hub is a mechanism for exchanging energy via the grids between its members (households, renewable energy plants, offices, businesses), who may be both consumers and suppliers. The members are concerned with energy generation within the built environment, district heating, cooling and power, energy conversion and storage, and sharing energy resources. The members exchange information on their energy production and energy needs with the Energy Hub. The Hub then distributes the available energy in the most efficient way.